code: def next(self):
      txt = ",".join(
          [
              "%04d" % len(self),
              "%04d" % len(self.data0),
              "%04d" % len(self.data1),
              self.data.datetime.date(0).isoformat(),
              "%04d" % len(self.pp),
              "%.2f" % self.pp[0],
          ]
      )
  
      print(txt)
  
file_path: backtrader/samples/pivot-point/ppsample.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import argparse
  import backtrader
  import backtrader.feeds
  import backtrader.utils.flushfile
label_desc: Use image node_id 2 for calling the St obj's underlying member method code with example usage: obj.next() without return types